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DOI: 10.5445/IR/1000076093#verlagsausgabe
DOI: 10.1016/j.electacta.2017.10.054

Phosphoric Acid Invasion in High Temperature PEM Fuel Cell Gas Diffusion Layers

Bevilacqua, N.; George, M.G.; Galbiati, S.; Bazylak, A.; Zeis, R.

In this work, liquid phosphoric acid was injected into polymer electrolyte membrane fuel cell (PEMFC) gas diffusion layers (GDLs) to visualize the invasion patterns developed at breakthrough. Three-dimensional (3D) images of the GDLs were obtained through X-ray computed tomography, and equivalent pore networks were generated as the basis for pore network simulations using OpenPNM. Strong qualitative agreement was obtained between the simulated and experimentally observed liquid phosphoric acid invasion patterns, which provided validation for the numerical modeling. Different GDL materials were evaluated by examining the effects of a micro porous layer (MPL) and pore size distribution on the saturation and distribution of phosphoric acid. The MPL was shown to restrict liquid phosphoric acid from entering the carbon fiber substrate. The overall phosphoric acid saturation at breakthrough was found to decrease significantly for samples containing an MPL due to the smaller pore sizes. Further, the influence of cracks in an MPL on overall saturation at breakthrough was investigated. It was observed that a crack-free MPL provided a more ef ... mehr

Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Physikalische Chemie (IPC)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 0013-4686, 1873-3859
URN: urn:nbn:de:swb:90-760933
KITopen ID: 1000076093
HGF-Programm 37.01.01; LK 01
Erschienen in Electrochimica acta
Band 257
Seiten 89–98
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